Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering of the University of Illinois, U.S. Bureau of Mines
Notes
Item does not contain copyright information.
Addeddate
2012-10-18 16:06:09
Associated-names
Illinois State Geological Survey; University of Illinois (Urbana-Champaign campus). Dept. of Mining Engineering; United States. Bureau of Mines